<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let number = 18
        let person = {
            name : "张三",
            sex : "男",
        }
        Object.defineProperty(person,"age",{
            // value:number,
            // enumerable:true, // 控制属性是否可以枚举，默认值是false
            // writable:true, // 控制属性是否可以被修改，默认值是false
            // configurable:true, // 控制属性是否可以被删除，默认值是false
            get() {
                console.log("有人读取了age属性")
                return number
            },
            set(value) {
                console.log("有人修改了age属性")
                number = value
            }
        })
        console.log(person)
    </script>
</body>
</html>